There are disadvantages to a box thats just too big.
Ever drop a drain plug in there and it rolled to the exact middle of the box? Pain in the butt to get it out!
Not sure if I had that happen, but I can see your point. I had the doors on each end so I could open them with the boat on top... Maybe some sort of opening on the top would really facilitate access... But for $75 all in, it was a good temporary solution (this was way before you started making boxes, by the way) for a few years.
Couldn't you just tip the trailer up to help the drain plug roll to the low side?
